Third Party Reference Check? - Salary Slips

I have the following queries....
· HOW STRONG IS Third PARTY REFERENCE Check?
· What are the basic details which these 3rd party ref agency check?
· How Do these agency check the last Drawn Salary of the candidate?
· How much time does it take to check all the details?

Recently, few people i Know joined a Cmmi L 5 company wherein they have submitted fake salary slips(PDF) and were offered good CTC.
is it so easy for a candidate to just manipulate salary slip and get a good offer? What % chances are that they can get Caught in coming future?

Thanks and Regards

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